Call apparatus in a single oscillator microwave transceiver

Claim 2

A single oscillator microwave transceiver with calling apparatus, comprising: directional antenna means for transmitting and receiving microwaves; an FM information receiver having a first IF frequency; a microwave mixer feeding said FM receiver; mixer input means for coupling energy into said mixer; a broad beam antenna; a narrow band receiver responsive to the output of said mixer, and having a second IF frequency different from said first IF frequency; a single microwave oscillator; means for coupling energy from said broad beam antenna into said mixer input means; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said mixer input means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the intermediate frequency of either of said receivers; and signaling means responsive to the output of said narrow band receiver for signaling receipt by said mixer input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 3

A single oscillator microwave transceiver with calling apparatus, comprising: a single microwave oscillator; receiver means including an information IF amplifier driving an FM discriminator and a call IF amplifier driving an AM detector, said IF amplifiers having different center frequencies; antenna means for transmitting and receiving microwaves; means for coupling energy from said oscillator to said antenna means for transmission thereby, and for coupling eneRgy received at said antenna means mixed with a small portion of the energy of said oscillator to the input of said receiver means; and selectively operable means for controlling the frequency of said oscillator selectively, either in response to a DC signal for controlling the information carrier frequency of said oscillator for transmission or reception of information or in response to a slowly varying signal for transmitting a calling signal comprising a carrier wave having a corresponding slowly varying frequency centered about a frequency on the same order of magnitude as said information carrier frequency and differing therefrom by the center frequency of said call IF amplifier.

Claim 4

A single oscillator microwave transceiver with calling apparatus, comprising: a single microwave oscillator; receiver means including an information IF amplifier driving an FM discriminator and a call IF amplifier driving an AM detector, said IF amplifiers having different center frequencies; antenna means for transmitting and receiving microwaves; means for coupling energy from said oscillator to said antenna means for transmission thereby, and for coupling eneRgy received at said antenna means mixed with a small portion of the energy of said oscillator to the input of said receiver means; and selectively operable means for controlling the frequency of said oscillator selectively, either in response to a DC signal for controlling the information carrier frequency of said oscillator for transmission or reception of information or in response to a slowly varying signal for transmitting a calling signal comprising a carrier wave having a corresponding slowly varying frequency centered about a frequency on the same order of magnitude as said information carrier frequency and differing therefrom by the center frequency of said call IF amplifier.

Claim 5

A communication system comprising a pair of tranceivers according to claim 2, said selectively operable means in a first one of said transceivers providing said DC signal, said selectively operable means in a second one of said transceivers providing said slowly varying signal.

Claim 6

A single oscillator microwave transceiver with calling apparatus, comprising: directional antenna means for transmitting and receiving microwaves; broad beam antenna means; receiver means including an information IF amplifier driving an FM discriminator and a narrow band call IF amplifier driving an AM detector, said IF amplifiers having different center frequencies; a microwave mixer; a matching preamplifier driven by said mixer and feeding said receiver means; mixer input means for coupling energy into said mixer; a single microwave oscillator; means for coupling energy from said broad beam antenna into said mixer input means; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said mixer input means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; selectively operable means for controlling the frequency of said oscillator selectively in response to a DC signal for controlling the information carrier frequency of said oscillator for transmission or reception of information or in response to a slowly varying signal for transmitting a calling signal comprising a carrier wave having a corresponding slowly varying frequency centered about a frequency on the same order of magnitude as said information carrier frequency and differing therefrom by the center frequency of said narrow band call IF amplifier; and signal means responsive to the output of said narrow band receiver to signal receipt by said mixer input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 7

A single oscillator microwave transceiver with calling apparatus, comprising: directional antenna means for transmitting and receiving microwaves; broad beam antenna means; receiver means including an information IF amplifier driving an FM discriminator and a narrow band call IF amplifier driving an AM detector, said IF amplifiers having different center frequencies; a microwave mixer; a matching preamplifier driven by said mixer and feeding said receiver means; mixer input means for coupling energy into said mixer; a single microwave oscillator; means for coupling energy from said broad beam antenna into said mixer input means; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said mixer input means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; selectively operable means for controlling the frequency of said oscillator selectively in response to a DC signal for controlling the information carrier frequency of said oscillator for transmission or reception of information or in response to a slowly varying signal for transmitting a calling signal comprising a carrier wave having a corresponding slowly varying frequency centered about a frequency on the same order of magnitude as said information carrier frequency and differing therefrom by the center frequency of said narrow band call IF amplifier; and signal means responsive to the output of said narrow band receiver to signal receipt by said mixer input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 8

A communication system comprising a pair of transceivers according to claim 4, said selectively operable means in a first one of said transceivers providing said DC signal, said selectively operable means in a second one of said transceivers providing said slowly varying signal.

Claim 9

A single oscillator microwave transceiver with calling apparatus, comprising: directional antenna means for transmitting and receiving microwaves; broad beam antenna means for transmitting and receiving microwaves; receiver means including an information IF amplifier, having a first center frequency, driving an FM discriminator and a narrow band call IF amplifier, having a second center frequency substantially half of said first center frequency, driving an AM detector; a microwave mixer; a matching preamplifier driven by said mixer and feeding said receiver means; mixer input means for coupling energy into said mixer; a single microwave oscillator; means for coupling energy from said brOad beam antenna means into said mixer input means; a DC voltage source for providing a DC voltage suitable for controlling the nominal carrier frequency of said microwave oscillator; an AFC circuit connected to the output of said FM receiver for controlling the carrier frequency of said oscillator to be separated from said nominal carrier frequency by said first IF frequency; a sweep source of a slowly varying DC voltage for sweeping the carrier frequency of said microwave oscillator slowly about a frequency separated from said nominal carrier frequency by substantially said second IF frequency; summing means, the output of said summing means being connected to said frequency controlling voltage input of said microwave oscillator; input means for applying transmitter input modulation to one input of said summing means; selectively operable means for connecting said AFC circuit, said DC voltage source or said sweep source to a second input of said summing means, alternatively, whereby said microwave oscillator provides a carrier frequency selectively determined by said AFC circuit or by said DC voltage source, which may be frequency modulated in accordance with said transmitter input modulation, or by said sweep source; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said mixer input means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; and signal means responsive to the output of said narrow band receiver to signal receipt by said mixer input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 10

A single oscillator microwave transceiver with calling apparatus, comprising: directional antenna means for transmitting and receiving microwaves; broad beam antenna means for transmitting and receiving microwaves; receiver means including an information IF amplifier, having a first center frequency, driving an FM discriminator and a narrow band call IF amplifier, having a second center frequency substantially half of said first center frequency, driving an AM detector; a microwave mixer; a matching preamplifier driven by said mixer and feeding said receiver means; mixer input means for coupling energy into said mixer; a single microwave oscillator; means for coupling energy from said brOad beam antenna means into said mixer input means; a DC voltage source for providing a DC voltage suitable for controlling the nominal carrier frequency of said microwave oscillator; an AFC circuit connected to the output of said FM receiver for controlling the carrier frequency of said oscillator to be separated from said nominal carrier frequency by said first IF frequency; a sweep source of a slowly varying DC voltage for sweeping the carrier frequency of said microwave oscillator slowly about a frequency separated from said nominal carrier frequency by substantially said second IF frequency; summing means, the output of said summing means being connected to said frequency controlling voltage input of said microwave oscillator; input means for applying transmitter input modulation to one input of said summing means; selectively operable means for connecting said AFC circuit, said DC voltage source or said sweep source to a second input of said summing means, alternatively, whereby said microwave oscillator provides a carrier frequency selectively determined by said AFC circuit or by said DC voltage source, which may be frequency modulated in accordance with said transmitter input modulation, or by said sweep source; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said mixer input means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; and signal means responsive to the output of said narrow band receiver to signal receipt by said mixer input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 11

A communication system comprising a pair of transceivers according to claim 6, said selectively operable means in a first one of said transceivers operated to connect either said DC source or said AFC circuit to said summing means, said selectively operable means in a second one of said transceivers operated to connect said sweep source to said summing means.

Claim 12

A single oscillator microwave transceiver with calling apparatus, comprising: broad beam antenna means for transmitting and receiving microwaves; directional antenna means for transmitting and receiving microwaves; receiver means including an FM information receiver having a first IF frequency and a narrow band AM receiver having a second IF frequency different from said first IF frequency; receiver input means for coupling energy into said receiver means; a single microwave oscillator; means for coupling energy from said broad beam antenna into said receiver input means; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said receiver input means, whereby said single oscillator provides both microwave energy for transmission by said receiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the intermediate frequency of either of said receivers; and signal means responsive to the output of said narrow band receiver to signal receipt by said receiver input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 13

A single oscillator microwave transceiver with calling apparatus, comprising: broad beam antenna means for transmitting and receiving microwaves; directional antenna means for transmitting and receiving microwaves; receiver means including an FM information receiver having a first IF frequency and a narrow band AM receiver having a second IF frequency different from said first IF frequency; receiver input means for coupling energy into said receiver means; a single microwave oscillator; means for coupling energy from said broad beam antenna into said receiver input means; means for coupling energy from said oscillator to said directional antenna means for transmission thereby, and for coupling energy received at said directional antenna means and a small portion of the energy of said oscillator to said receiver input means, whereby said single oscillator provides both microwave energy for transmission by said receiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the intermediate frequency of either of said receivers; and signal means responsive to the output of said narrow band receiver to signal receipt by said receiver input means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 14

A single oscillator microwave transceiver with calling apparatus, comprising: antenna means for transmitting and receiving microwaves; receiver means including an information IF amplifier, having a first center frequenCy, driving an FM discriminator, and a narrow band call IF amplifier, having a second center frequency substantially half of said first center frequency, driving an AM detector; a single microwave oscillator having a frequency controlling input; a DC voltage source for providing a DC voltage suitable for controlling the nominal carrier frequency of said microwave oscillator; an AFC circuit connected to the output of said FM receiver for controlling the carrier frequency of said oscillator to be separated from said nominal carrier frequency by said first IF frequency; a sweep source of a slowly varying DC voltage for sweeping the carrier frequency of said microwave oscillator slowly about a frequency separated from said nominal carrier frequency by substantially said second IF frequency; summing means, the output of said summing means being connected to said frequency controlling input of said microwave oscillator; input means for applying transmitter input modulation to one input of said summing means; selectively operable means for connecting said AFC circuit, said DC voltage source or said sweep source to a second input of said summing means, alternatively, whereby said microwave oscillator provides a carrier frequency selectively determined by said AFC circuit or by said DC voltage source, which may be frequency modulated in accordance with said transmitter input modulation, or by said sweep source; means for coupling energy from said oscillator to said antenna means for transmission thereby, and for coupling energy received at said antenna means and a small portion of the energy of said oscillator to said receiver means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; and signal means responsive to the output of said narrow band receiver to signal receipt by said receiver means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 15

A single oscillator microwave transceiver with calling apparatus, comprising: antenna means for transmitting and receiving microwaves; receiver means including an information IF amplifier, having a first center frequenCy, driving an FM discriminator, and a narrow band call IF amplifier, having a second center frequency substantially half of said first center frequency, driving an AM detector; a single microwave oscillator having a frequency controlling input; a DC voltage source for providing a DC voltage suitable for controlling the nominal carrier frequency of said microwave oscillator; an AFC circuit connected to the output of said FM receiver for controlling the carrier frequency of said oscillator to be separated from said nominal carrier frequency by said first IF frequency; a sweep source of a slowly varying DC voltage for sweeping the carrier frequency of said microwave oscillator slowly about a frequency separated from said nominal carrier frequency by substantially said second IF frequency; summing means, the output of said summing means being connected to said frequency controlling input of said microwave oscillator; input means for applying transmitter input modulation to one input of said summing means; selectively operable means for connecting said AFC circuit, said DC voltage source or said sweep source to a second input of said summing means, alternatively, whereby said microwave oscillator provides a carrier frequency selectively determined by said AFC circuit or by said DC voltage source, which may be frequency modulated in accordance with said transmitter input modulation, or by said sweep source; means for coupling energy from said oscillator to said antenna means for transmission thereby, and for coupling energy received at said antenna means and a small portion of the energy of said oscillator to said receiver means, whereby said single oscillator provides both microwave energy for transmission by said transceiver and microwave energy for mixing with the energy received by said transceiver so as to provide energy at the center frequency of either of said IF amplifiers; and signal means responsive to the output of said narrow band receiver to signal receipt by said receiver means of a received signal having a frequency differing from the frequency of said oscillator by said second IF frequency.

Claim 16

A communication system comprising a pair of transceivers according to claim 9, said selectively operable means in a first one of said transceivers operated to connect either said DC source or said AFC circuit to said summing means, said selectively operable means in a second one of said transceivers operated to connect said sweep source to said summing means.